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Cisco IOS GRE Decapsulation Vulnerability
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Secunia Advisory:
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SA21783
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Release Date:
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2006-09-07
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Last Update:
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2006-09-13
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Popularity:
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10,536 views
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Critical:
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Less critical
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Impact:
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Security Bypass
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Where:
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From local network
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Solution Status:
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Vendor Patch
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| OS: | Cisco IOS 12.x
Cisco IOS R12.x
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Secunia CVSS-2 Score:
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Available in Secunia business solutions 
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| Advisory Content (Page 1 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
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Description:
FX has reported a vulnerability in Cisco IOS, which can be exploited by malicious people to bypass certain security restrictions.
The vulnerability is caused due to an error within the handling of GRE packets with source routing information as the offset field is not verified before being used to decapsulate a packet. This can potentially be exploited to bypass access control lists on the router by sending specially crafted packets.
The vulnerability affects Cisco IOS 12.0, 12.1, and 12.2 based trains when configured with GRE IP or GRE IP multipoint tunnels.
NOTE: Cisco IOS version 12.0S, with a revision later than 12.0(23)S, with CEF enabled is not affected.
Change Page:
[ 1 ] [ 2 ] [ 3 ]
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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